Any time a land unit takes 2% or greater losses in GITM, it must make a morale check. If it fails the morale check, then it may retreat or rout. The chance of a rout or retreat depends on the number of casualties taken, the unit's quality and experience, its fatigue, whether it has open flanks, and whether it has won or lost a melee. The base chance depends on the percentage of losses the unit has taken:

Losses |
2-5% |
5-10% |
10-20% |
20-30% |
30-40% |
40-50% |
50%+ |

Retreat chance |
2.5% |
5% |
10% |
25% |
40% |
50% |
60% |

Rout chance |
1% |
2% |
4% |
10% |
16% |
20% |
24% |

This is then modified as follows:

Quality |
Very Poor |
Poor |
Fair |
Average |
Good |
Very Good |
Excellent |

Retreat chance |
x1.3 |
x1.2 |
x1.05 |
- |
x0.95 |
x0.9 minus 5% |
x0.8 minus 10% |

Rout chance |
x1.5 |
x1.3 |
x1.1 |
- |
x0.9 |
x0.95 minus 2% |
x0.6 minus 5% |

Experience |
0 |
1-3 |
4-8 |
9-15 |
16-24 |
25-35 |
36-48 |
49-63 |
64+ |

Retreat chance | x2 |
x1.5 |
x1.2 |
x1.1 |
- |
x0.95 |
x0.9 |
x0.8 |
x0.7 |

Rout chance | x3 |
x2 |
x1.5 |
x1.2 |
- |
x0.9 |
x0.8 |
x0.6 |
x0.5 |

Fatigue |
0-2 |
3-5 |
6-8 |
9-11 |
12+ |

Retreat chance | x0.75 |
x0.9 |
- |
x1.2 |
x1.5 |

Rout chance | x0.75 |
x0.9 |
- |
x1.2 |
x2 |

Units with one flank open: retreat chance x1.1, rout chance x1.1

Units with both flanks open: retreat chance x1.2, rout chance x1.2

Units winning melee: Subtract 10% from retreat chance and 20% from rout chance

Units losing melee: Add 10% to retreat chance and 20% to rout chance